The TV streams can be viewed using any software that can play RTSP streams (like VLC). IPTV is different, so the answer is probably "no". Also, the IPTV receiver would not be able to tell MP to start streaming a particular channel or to change to a different channel.You can view the video stream from MediaPortal to a general IPTV receiver ?
Do you mean skins?Would it be possible to customize the display of each client from MediaPortal?